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  1. #1
    ROG Junior Member Array
    Join Date
    Jul 2022

    Rog crosshair viii dark hero & sli on PCIEX16_3

    Hey all,

    I've installed 2x ASUS Strix 2080 Ti (with NVLink bridge) to get SLI but the initial problem I got was that the cards wer.e too close to each other thus the temp of the one that's above was too high.

    Then I've moved the bottom one to the bottom PCIEX16_3 slot while the first one stayed in PCIEX16_1

    Once I've botted up the machine, the SLI isn't working and I think the culprit is PCIEX16_3 that's working in x4 mode.

    According to this "Two available PCIe x16 slots on your motherboard that will run at x8 (ideally the full x16 lanes) with multiple GPUs installed. SLI is not supported if a slot runs at x4." it would be likely the main problem.

    AFAIK, NVLink isn't necessary if I am not planning to use memory pooling.

    Any advice here?

    How can I get the PCIEX16_3 work in x8 mode?

    My CPU is AMD Ryzen 9 5950X.

    MB Manual

  2. #2
    ROG Enthusiast Array Rolda PC Specs
    Rolda PC Specs
    MotherboardROG Crosshair VIII Dark Hero
    ProcessorRyzen 7 5800X
    Memory (part number)2x Kingston KF3200C16D4/16GX (32GB)
    Graphics Card #1TUF-RX6900XT-O16G-GAMING
    MonitorROG Strix XG49VQ
    Storage #1Samsung NVMe 970 EVO 500GB
    Storage #2Seagate ST3000DM007 3TB
    CPU CoolerROG Ryujin II 360
    Power Supplybe quiet! Power Zone 1000W
    Keyboard Roccat Ryos MK Pro
    Mouse Roccat Tyon
    OS Win 11 Pro x64 21H2

    Join Date
    Sep 2011

    It is not possible. Look at the motherboard from below.
    There are no physical links.
    Last edited by Rolda; 07-21-2022 at 03:51 PM.

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